Furnace-bottom.



'110.728,578. 7 PATENTED 11m19.190s;

. VJ. HUXLBY. `FURNAC'E BOTTOM.

APPLIOATION-IILED 001229. 1902.

UNITED Y STATES- Patented May 19, 1903.

JOHN HUXLEY, OF WASHINGTON, PENNSYLVANIA.

'FuRNAol-z-eorroM.`

SPECIFICATION formng'part of Letters Patent No. 728,578, dated May 19, 1903.

Application filed October 29, 1902. Serial No. 129,276. (No model.) K

for such furnaces as are employed for anneal ing or for other similar purposes wherein metal sheets or bars are to be placedin the furnace and subjected -to a high degree of heat for bringing Vthe plates or bars to the desired temperature for rolling or otherwise working the same.

The object of Ymy invention is to provide a furnace-bottom of such a construction that the metal sheet or plate is supported in a manner which will prevent any dirt or other foreign substance adhering to the sheet orbar; furthermore,to providea furnacelbottom havinga series of skids, each of which may be in-V dependently removed and each of which is reversible, wherebya new supporting edge may be presented in case one edge becomes worn or damaged.

' Briefly described,my invention comprises a supporting-skid which in end view or crosssection is substantially triangular in shape, the three wide sides thereof being concave and the skid having a Vbore or aperture throughout its lengthto prevent the warping thereof when subjected to intense heat. -A series of these skids are employed for form ing the bottom, and the space between the respective rows of skids is filled in with flre= brick or other refractory material. A portion of the skids projects above the fire-brick or other material, and on this projecting portion the plates, sheets, or bars to beI heated are placed, thus supporting such material above and out of contactwith the lire-brick or other material and preventing contact of the sheets or bars therewith.

Heretofore and before my invention sheets or plates such as are employed in the manufacture of tin plate have generally been placed in the furnace, the bottom of which was composed of fire-brick or like V material and upon which thesheets or plates rested. Sometimes the sheets vor plateshave been supported by bricks placed between the sheets or plates and the Vfurnace-bottom. In handling the sheets orvplates, however, the bricks of which the furnace-bottom is composed become chipped and also considerable dust arises from the material on which the bottom is formed, and this -dust and theA specification, and wherein like numerals of reference indicate like parts throughout the several views, in which- Figure l is a topplan View of the furnacebottom constructed in accordance withmy invention,the bottom being vpartly broken away. Fig. 2 is a central longitudinal vsectional view through the furnace-bottom construoted in accordance with my invention, the bottom being partly broken away. Fig. 3 is a detail perspective viewfof one of the supporting-skids. Fig. 4 is a detail perspective view ofone of the brick.

A As heretofore stated, this invention is parother like'furnaces in which the plates or bars are to be4 placed and subjected to a high degree of heat. In such furnaces the bottoms 'are closed and the-heat is suitably introduced into the furnace above the bottoms. In the accompanying illustration of my invention 1 indicates the side wallsv of the furnace, and 2 the base thereof, which are constructed of any suitable material. On the base 2 is placed myimproved furnace-bottom which forms the subject of this application. This furnacebottom is constructed of a series of independent skids 3, which are composed of metal, and in practice I have found the most y desirable material to be the commonest burned castscrap that is obtainable, as with such material all elementary constituents ordinarily contained inthe material have been burned ticularly adapted for annealing-furnaces and IOO out of the scrap, and consequently the latter will not scale in the furnace. These skids in end view or cross-section are substantially triangular in shape, the three side walls thereof being concave, and each skid has a bore or provided with an aperture 4, extending centrally therethrough, this aperture being provided to prevent the warping of the skid when subjected to intense heat. With this shape of skid it will be noted that three supporting edges 5 will be provided on each skid, and when the supporting edge which is being used becomes worn or dama-ged the skid may be reversed or placed on another of its sides, so as to present a new supporting edge above the level line of the furnace. In the construction of a furnace-bottom in accordance with my invention I preferably form the skids 3 of a length which will require a number of the same placed end to end in order to reach across the furnace-bottom, as in this construction in event of the supporting edge of one skid becoming damaged it may readily be turned, so as to presenta new supporting edge, or an entirely new skid may be readily placed in position. The skids are preferably placed end to end in rows, as shown in Fig. l of the drawings, the space between the rows of skids being filled with tire-brick or other refractory material 6, and where tire-brick is used for this purpose these bricks will be molded so as to lit the concave sides of the two adjacent rows of skids and also the space below the concave sides of the skids. The space beneath the skids and along the two inactive supporting edges is preferably lilled with fire-clay 7 or other refractory material. It will be noted that with the furnace-bottom of this construction the plates or sheets placed upon the supporting edge of the skid will be supported in such a manner that the same will not in any way contact with the refractory material of the furnace-bottom, and all danger of any foreign substance adhering to the plates or sheets is prevented. The skids being reversible, whereby the new supporting edges may be presented, serves to materially increase the life of the furnace-bottom.

It will be observed that the concave sides of the skids are not absolutely essential in the practice of the invention; but I preferably form the skids in this manner, for the reason that in so doing I present the two supporting edges 8, which rest upon the base 2 of the furnace, thus permitting of the insertion of fire-clay therebeneath, whereby less heat will be communicated to the base than if the entire underneath face of the skid rested dat upon the base 2. Furthermore, the concave sides provide for the greater amount of filling between the skids and around the same than would otherwise be obtained.

I desire to call particular attention to the durability of the f urnace-bottom constructed in accordance with my invention and also the economy in this construction of furnace-bottom. The skids being preferably made of burned scrap will last for a considerably greater length of time than the furnace-bottom constructed of fire-brick or like material. Not only will the one supporting edge of these skids last much longer than the furnace-bottom constructed of tire-brick or like material, but by reason of the skids being reversible and having three supporting sides or supporting edges the life of the furnace-bottom is increased to several times that of the ordinary furnace-bottom.

In the practice of the invention it will be noted that various changes may be made in the details of construction without departing from the general spirit of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a furnace-bottom, a metal skid having concave sides in cross-section, and having a central bore from end to end, substantially as described.

2. A furnace-bottom comprising a series of metal skids having concave sidesin cross-sectionwhich are placed in rows end to end, and a filling of fire-clay or other refractory material between the rows of skids, substantially as described.

3. A furnace-bottom comprising a series of metal skids placed end to end in rows, said skids having concave sides and provided with a central aperture extending through the skid from end to end, and a filling of refractory material between the rows of skids and underneath the same, substantially as described.

4. A furnace-bottom consisting of rows of metal skids having concave side faces and provided with an aperture extending therethrough from end to end of the skids, and a filling of clay or other refractory material between the rows of skids, the uppermost edge of the skids extending above the filling of clay or other material, substantially as described.

5. A skid for furnace-bottoms consisting of a substantially triangular shape bar having concave side faces and provided with an aperture extending therethrough from end to end, substantially as described.

6. As a new article of manufacture, a metal skid for furnace-bottoms, said skid having three concave side faces and three supporting edges and provided with an aperture eX- tending through the skid from end to end thereof, substantially as described.

In testimony whereof I affix my signature in the presence of two witnesses.

JOI-IN IIUXLEY.

Witnesses:

W. F. SMITH, W. E. DAVIS.

IOO 

